Well, I got a cheap little digital thermometer and found inside the rubbermaid it was high 80's-low 90's. Too hot. I switched the exhaust fan with a stronger one I had laying around. It's down to 75. My plants have some deformities though...curling leaves? Heat stress. Also as you will see in the picture, one of my plants has discoloration of the leaves I haven't seen before.

Expertise anyone?